Spedfication



srnctricnrxoiw. pat-t 35mm To all whom it may concern: Be it known that I, ALOYSMHLE, a subect of the Emperor of Germany, and a residentof Malstatt, near Saarbriicken, Germany, c .7 7 have nvented new and useful Improvements n Compounds forArtificial Stone, (forwhich I have obtained Letters Patent in France, No. 206,596, dated June 24, 1890; in Belgium, No. v 91,485, dated August 1, 1890, and in Austria- Hungary, No. 34,516 and No. 58,721, dated November 28, 1890,) of which the following is aspecification. V Artificial building and facing -'stones as a heretofore made of cement and furnace slag 5 were frequently found unreliable and apt to crumble. Itl as in fact not been possible previous to my invention, toobtain of cement andslag, a composition which would fairly resemble natural stones and at the same time have the same strength and power of resistance. After repeated experiments, I have f found that a thorou obtained if sa 0.

. ture, and the w o e mass is then put into 1 molds and properly shaped. This mixture of finely. ground sand, sandstone (chips), sulphureted furnaee-slag and a cementing ma- *-terial produces an artificial stone which is an exact re'presentationof the natural sandstone, having not only the same density, but often exceeding it. It can be made at low cost, requires onlyashort time to become suffioiently hardened, and has the advantage that it may easily be operated on soon after itsconstruc-' tionrm' a s I My compound for making artificial stone is used in the following manner: Chips of sandstone together n, and are rs roun to ow er, four parts 0 W10 mixture are then thoroughly mixed with about two parts offinely granulated sulphureted fur- 1 'na e-sla *Not every furnace-slag is suited or t 1s purpose,but only such slag as is pro- 5o' (duced in the manufacture o igiron nd l i ators front-n, r MALSTATP, NEAR sannnntionnn, eERMA 'coMPouNn F OR II'IF oIAL STONE. H I Patent No. 508,033, aatea mvemiisr 7, 1893.1 7 Application filed March 19,1392. taunt-425,580. (No specimens.) raenaainrmcoim21.1890,No.206,596;11 301 August 1,1890,No. 9l,48,andinAustria-Hungeryliovember 2 8,1890,No.84,516 andllo.68,721-

which n ac count of its peculiarcom po sition (being about thirty-five per cent. silicic acid, twenty-two per cent. clay and oxide of iron,forty-two per cent. lime, and a small quantity of sulphur) a great degree of resist powder; In granulating the slag, it is of I not be heated to a too high temperature, so

ance, and binds very well with the sandstone that the sulphur contained in the slag is not L driven out, as this sulphur forms an impor- 1 tant part in the subsequent combination of the mass. In order that the artificial stone mass thus obtained, may harden quiekly ng a;

part of Portland or other cement is added to six parts 0 e mass, an toregulatethe time Y o ardenlng, one to ten per centum of cara bouate of sgda is added. The whole mass 1s 1 t en t oroughly mixed by means of rotating 7 o sieves, or analogous devices, as it is of the utmost importance, not only that all the comf 1 ponent parts should be finely powdered, but I also that their mixture be as thorough as 'possible. To this well-mixed mass, as much an; ter as is necessary to make the mixture as moist as fresh earth, is added; more water;

being disadvantageous, as it may cause the stone to crack. 7 The moistpowder may be. then placedinto molds, whichpreferablyhave 8c; the profile or general configuration which the I 1 stone is to have, and the mixture is then tamped until some of the water is driven oif. After lying in the molds for from one to five hours, the stones are taken out and are then still soft enough to be worked with ordinary chisels or carpenter-like tools. During this time they receive the desired finish as to shape and profile, as they can be turned in a lathe, polished or only roughly worked on, as desired. This easy'shaping is only possible I when themasswhich is employed is in a finely grou'nd condition; otherwise it is liable to I crumble.

Perfect resemblance natural stone can only be'ootained by working on these artificial stones soon after they have been molded.

After about y items, will, as 4' ne 1 egreeof hardness that they re 1 The workifon onTy vwffistone-masoms tools. After eightdays they are even harder than natural sand-stones.

Stones constructed of my compound, which k were purposely subjected to varying temperatures and difierent degrees of. moisture, did

\ not show the least change in color or form,

\nor did they crack or crumble, and retained the same hardness throughout. It is ex 1 pressly repeated that these desirable results can only be obtained by employing the sulphuretedfurnace-slag of pig-iron, granulated, 1

dried and finely powdered;

I! claim is [5 7 A composition for artificial stone, comprising s u 1phuretet l slag,brick dust, wastesandstonasahflfbe 'ganoe-a'rwnate of soda, Q

In testimony whereof I have signed my 2o name to this specification in the presence of two subscribing witnesses.

, ALOYS MOHLE. Witnesses:

FRANZ HASSLACHER, FRIEDRICH QUEHL. 

